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Missing return statement in a non-void method compiles
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The Java compiler is smart enough to find the unreachable code ( the code after while loop)
and since its unreachable, there is no point in adding a return statement there (after while ends)
same goes with conditional if
publi...
Difference between matches() and find() in Java Regex
... {
Pattern p = Pattern.compile("\\d");
String candidate = "Java123";
Matcher m = p.matcher(candidate);
if (m != null){
System.out.println(m.find());//true
System.out.println(m.matches());//false
}
}
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What is the difference between compare() and compareTo()?
What is the difference between Java's compare() and compareTo() methods? Do those methods give same answer?
16 Answers
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Converting BigDecimal to Integer
...red Oct 28 '10 at 14:01
willcodejavaforfoodwillcodejavaforfood
38.4k1717 gold badges7676 silver badges107107 bronze badges
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Check if a value exists in ArrayList
... HashSet than an ArrayList when you are checking for existence of a value.
Java docs for HashSet says: "This class offers constant time performance for the basic operations (add, remove, contains and size)"
ArrayList.contains() might have to iterate the whole list to find the instance you are looki...
When would you use a WeakHashMap or a WeakReference?
... Article now at web.archive.org/web/20061130103858/http://weblogs.java.net/blog/…
– mjn42
Jan 30 '19 at 8:38
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How do I pass a variable by reference?
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I find it hard to buy. To me is just as Java, the parameters are pointers to objects in memory, and those pointers are passed via the stack, or registers.
– Luciano
Dec 13 '11 at 1:25
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Sorting arraylist in alphabetical order (case insensitive)
... return s1.compareToIgnoreCase(s2);
}
});
Or if you are using Java 8:
list.sort(String::compareToIgnoreCase);
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How to implement a ViewPager with different Fragments / Layouts
.... Of course, any layout-file can be used for the Fragments.
FirstFragment.java has a orange background layout, SecondFragment.java has a green background layout and ThirdFragment.java has a red background layout. Furthermore, each Fragment displays a different text, depending on which class it is f...
List of all special characters that need to be escaped in a regex
... message template with a message that a user is trying to send. I am using Java regex for matching the message. The template/message may contain special characters.
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